Military healthcare

A health worker helps the relatives of patients with COVID-19 load an empty oxygen tank into their car which they will take to a store to be refilled and bring back, outside the Joventina Dias Hospital in Manaus, Brazil, Friday, Jan. 15, 2021. Hospital staff and relatives of COVID-19 patients rushed to provide facilities with oxygen tanks just flown into the city as doctors chose which patients would breathe amid dwindling stocks and an effort to airlift some of them to other states. (AP Photo/Edmar Barros)

A woman wearing mask to help protect herself from the coronavirus stands in the sun as she walks her dogs in Beijing on Friday, Jan. 8, 2021. With next month's Lunar New Year travel rush looming, the government is telling people to stay put as much as possible and not travel to or from the capital Beijing. (AP Photo/Ng Han Guan)

A COVID-19 patient, placed on a ventilator, rests at St. Joseph Hospital in Orange, Calif. Thursday, Jan. 7, 2021. California health authorities reported Thursday a record two-day total of 1,042 coronavirus deaths as many hospitals strain under unprecedented caseloads. (AP Photo/Jae C. Hong)

Christians on the screen attend an online Christmas service for social distancing and a precaution against the coronavirus at the Yoido Full Gospel Church in Seoul, South Korea, Friday, Dec. 25, 2020. (AP Photo/Lee Jin-man)

A medical worker wearing protective gear speaks as people wait in queue during testing for COVID-19 at a coronavirus testing center in Seoul, South Korea, Saturday, Dec. 12, 2020. (AP Photo/Lee Jin-man)

FILE - In this July 7, 2020 file photo, Secretary of Veterans Affairs Richard Wilkie speaks at the National Press Club in Washington. Confronted with a sexual assault allegation at a veterans hospital, Veterans Affairs Secretary Robert Wilkie repeatedly sought to discredit the female congressional staffer who made the complaint. His staff also worked to spread negative information about her while ignoring known problems of harassment at the facility. That's according to a blistering investigation released Thursday by VA's internal watchdog. (AP Photo/Jacquelyn Martin)

FILE - In this July 7, 2020 file photo, Secretary of Veterans Affairs Richard Wilkie speaks at the National Press Club in Washington. Confronted with a sexual assault allegation at a veterans hospital, Veterans Affairs Secretary Robert Wilkie repeatedly sought to discredit the female congressional staffer who made the complaint. His staff also worked to spread negative information about her while ignoring known problems of harassment at the facility. That's according to a blistering investigation released Thursday by VA's internal watchdog. (AP Photo/Jacquelyn Martin)

FILE - This May 4, 2020, file photo provided by the University of Maryland School of Medicine, shows the first patient enrolled in Pfizer's COVID-19 coronavirus vaccine clinical trial at the University of Maryland School of Medicine in Baltimore. Pfizer’s COVID-19 vaccine is entering the final phase of review by U.S. government regulators. The Food and Drug Administration on Tuesday, Dec. 8 released a positive review of the vaccine. (Courtesy of University of Maryland School of Medicine via AP, File)

Rohingya refugees board a ship as they are ferried to Bhashan Char, or floating island, in the Bay of Bengal, from Chittagong, Bangladesh, Friday, Dec. 4, 2020. Authorities in Bangladesh on Friday started sending a first group of nearly more than 1,500 Rohingya refugees to an isolated island despite calls by human rights groups for a halt to the process. (AP Photo/Saleh Noman)